A source of sound and listener are approaching each other with a speed of 40 m / s . The apparent frequency of note produced by the source is 400 cps . Then, its true frequency (in cps ) is (velocity of sound in air = 360 m / s )

A source of sound and a listener are approaching each other with a speed of 40ms^(-1) The apparent frequency of a note produced by the source is 400 Hz. Then its true frequency is (velocity of sound in air = 360 ms^(-1) )

A source of sound and an observer are approaching each other with the same speed which is equal to (1)/(10) times the speed of sound. The apparent change in the frequency of the source is

A source of sound is moving towards a high wall with a speed of 20 m/s. The frequency of the sound produced by the source is 400 Hz. If the speed of the sound is 340 m/s, then the beat frequency heard by a person standing near the wall will be

A source of sound and an observer are approaching each other with the same speed, which is equal to (1/10) times the speed of sound. The apparent relative change in frequency of source is

If a source of sound of frequency upsilon and a listener approach each other with a velocity equal to (1//20) of velocity of sound, the apparent frequency heard by the listener is

A source and an observer approach each other with same velocity 50 m/s. If the apparent frequency is 434 Hz, then the real frequency is (Given velocity of sound = 332 m/s)

When both source and listener approach each other with a velocity equal to half the velocity of sound, the change in frequency of the sound as detected by the listener is (frequency of sound = n)

A source of sound is approaching an observer with speed of 30 m/s and the observer is approaching the source with a speed 60 m/s. Then the fractional change in the frequency of sound in air (330 m/s) is